I remove mine when I see roots forming, usually about 1/8" to 1/4" long. They are very fragile at this point, easy to break. I use damp moss, but have also wrapped in a paper towel and done it in a baggie. I blow the baggie full of air before closing it. Some cuttings rooted along the whole length, but when they are put into cups they seem to figure out where the roots need to grow. Some of the cuttings started forming leaves before roots, so I went ahead and potted them. They ended up growing roots just fine. I have had good luck using my water heater for a warm environment. I put a towel underneath the container to make sure they didnt get too hot. I dont think they need darkness, but I am new to this as well. Just remember not too wet. Wring out your moss as best you can, and open the containers or bags every day to give it some fresh air.
Note that I am extremely green to all of this so I am just relaying what has worked for me.
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